1/* 2 * OpenVPN -- An application to securely tunnel IP networks 3 * over a single TCP/UDP port, with support for SSL/TLS-based 4 * session authentication and key exchange, 5 * packet encryption, packet authentication, and 6 * packet compression. 7 * 8 * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 12 * as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program (see the file COPYING included with this 21 * distribution); if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25#ifndef DHCP_H 26#define DHCP_H 27 28#include "common.h" 29#include "buffer.h" 30#include "proto.h" 31 32#pragma pack(1) 33 34/* DHCP Option types */ 35#define DHCP_PAD 0 36#define DHCP_ROUTER 3 37#define DHCP_MSG_TYPE 53 /* message type (u8) */ 38#define DHCP_END 255 39 40/* DHCP Messages types */ 41#define DHCPDISCOVER 1 42#define DHCPOFFER 2 43#define DHCPREQUEST 3 44#define DHCPDECLINE 4 45#define DHCPACK 5 46#define DHCPNAK 6 47#define DHCPRELEASE 7 48#define DHCPINFORM 8 49 50/* DHCP UDP port numbers */ 51#define BOOTPS_PORT 67 52#define BOOTPC_PORT 68 53 54struct dhcp { 55# define BOOTREQUEST 1 56# define BOOTREPLY 2 57 uint8_t op; /* message op */ 58 59 uint8_t htype; /* hardware address type (e.g. '1' = 10Mb Ethernet) */ 60 uint8_t hlen; /* hardware address length (e.g. '6' for 10Mb Ethernet) */ 61 uint8_t hops; /* client sets to 0, may be used by relay agents */ 62 uint32_t xid; /* transaction ID, chosen by client */ 63 uint16_t secs; /* seconds since request process began, set by client */ 64 uint16_t flags; 65 uint32_t ciaddr; /* client IP address, client sets if known */ 66 uint32_t yiaddr; /* 'your' IP address -- server's response to client */ 67 uint32_t siaddr; /* server IP address */ 68 uint32_t giaddr; /* relay agent IP address */ 69 uint8_t chaddr[16]; /* client hardware address */ 70 uint8_t sname[64]; /* optional server host name */ 71 uint8_t file[128]; /* boot file name */ 72 uint32_t magic; /* must be 0x63825363 (network order) */ 73}; 74 75struct dhcp_full { 76 struct openvpn_iphdr ip; 77 struct openvpn_udphdr udp; 78 struct dhcp dhcp; 79# define DHCP_OPTIONS_BUFFER_SIZE 256 80 uint8_t options[DHCP_OPTIONS_BUFFER_SIZE]; 81}; 82 83#pragma pack() 84 85in_addr_t dhcp_extract_router_msg (struct buffer *ipbuf); 86 87#endif 88